Please open a ticket at https://tickets.cpanel.net and consult with our technical analysts. This sounds like a potential error with your Apache's httpd.conf that is not being handled well by the feature. You may find more information in the cPanel error log at /usr/local/cpanel/logs/error_log

However, I still recommend opening a ticket to have it investigated further. Please post back here once you've opened a ticket with your ticket number.